Copyright © 1999 Terramite Corporation
General Tightening Torque for Bolts, Nuts and Taperlock Studs
The following charts give the standard torque values for bolts, nuts and taperlock studs for SAE Grade 5
or better quality.
Use these torques for bolts and nuts with
standard threads (conversions are ap-
proximate).
Thread
Size Standard Torque
Inches Lb. Ft. N
.
m*
1/4 9 ± 3 12 ± 4
5/16 18 ± 5 25 ± 7
3/8 32 ± 5 45 ± 7
7/16 50 ± 10 70 ± 15
1/2 75 ± 10 100 ± 15
9/16 110 ± 15 150 ± 20
5/8 150 ± 20 200 ± 25
3/4 265 ± 35 360 ± 50
7/8 420 ± 60 570 ± 80
1-/ 640 ± 80 875 ± 100
1-1/8 800 ± 100 1100 ± 150
1-1/4 1000 ± 120 1350 ± 175
1-3/8 1200 ± 150 1600 ± 200
1-1/2 1500 ± 200 2000 ± 275
*1 newton meter (N
.
m) is approximately the same as 0.1 mkg.
standard thread
Metric Fasteners
[Usually, material strength identification on
bolt head is with number (i.e., 8.8, 10.9, etc.)]
The chart on the right gives the torque for
bolts and nuts with Grade 8.8.
NOTICE: Caution must be taken to avoid
mixing metric and standard (customary)
fasteners. Mismatched or incorrect fasteners
can result in vehicle damage or malfunction,
or possible personal injury. Original fasteners
removed from the vehicle should be saved
for assembly when possible. If new ones are
required, caution must be taken to replace
with one that is of same part no. and grade or
better.
Metric ISO Thread
Thread
Size Torque
(mm) (N-m*) (Lb. Ft.)
M6 12 ± 4 9 ± 3
M8 25 ± 7 18 ± 5
M10 55 ± 10 40 ± 7
M12 95 ± 15 70 ± 10
M14 150 ± 20 110 ± 15
M16 220 ± 30 160 ± 20
M18 325 ± 50 240 ± 35
M20 450 ± 70 330 ± 50
M22 600 ± 90 440 ± 65
M24 775 ± 100 570 ± 75
M27 1150 ± 150 840 ± 110
M30 1610 ± 200 1175 ± 150
M33 2000 ± 275 1450 ± 200
M36 2700 ± 400 2000 ± 300
ISO - International Standard Organization
*1 newton meter (N
.
m) is approximately the same as 0.1 mkg.
4.5
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